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Q: 

Unable to call PSI functions in Shared Services

I can't call PSI functions using the Shared Services impersonation. I get a "The request failed with HTTP status 401: Unauthorized." error.

I'm using the common Derived class to do it, and it doesn't even work in ProjTool (Project Server 2007 SDK sample).

It works without impersonation (i.e. by the pwa/_vti_bin/psi/...asmx) but not through Shared Services, for any user.

I have a double server environment (SQL Server + App Server).

There is no firewall between the servers.

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